diff --git a/com.unity.ml-agents/Runtime/Sensors/ObservationWriter.cs b/com.unity.ml-agents/Runtime/Sensors/ObservationWriter.cs
index 5b0b96b3df..2e1f0f2336 100644
--- a/com.unity.ml-agents/Runtime/Sensors/ObservationWriter.cs
+++ b/com.unity.ml-agents/Runtime/Sensors/ObservationWriter.cs
@@ -209,9 +209,11 @@ public void Add(Quaternion quat, int writeOffset = 0)
         }
     }
 
+    /// <summary>
+    /// Provides extension methods for the ObservationWriter.
+    /// </summary>
     public static class ObservationWriterExtension
     {
-
         /// <summary>
         /// Writes a Texture2D into a ObservationWriter.
         /// </summary>